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Thermal conductivity of polymer composites based on the length of multi-walled carbon nanotubes
Affiliation:1. Carbon Composite Materials Research Center, Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), 92 Chudong-ro, Bongdong-eup, Wanju-gun, Jeonbuk, 565-905, Republic of Korea;2. Nanomaterials Science and Engineering, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 305-350, Republic of Korea;1. State Key Laboratory of Marine Environmental Science, Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem, College of the Environment and Ecology, Xiamen University, Xiamen 361005, China;2. Shenzhen Research Institute of Xiamen University, Shenzhen, China;1. Vanderbilt University, Department of Interdisciplinary Materials Science, Olin Hall 2301 Vanderbilt Place, Nashville TN 37235-1604, USA;2. NASA-Marshall Space Flight Center, Materials Test Branch, Mailcode: EM10 Building 4601 RM 4322, MSFC, AL 35812, USA;3. Vanderbilt University, Department of Chemical and Biomolecular Engineering, Olin Hall 2301 Vanderbilt Place, Nashville, TN 37235-1604, USA;4. Fisk University, Department of Life and Physical Sciences, 1000 17th Ave North, Nashville, TN 37208, USA;1. Carbon Composite Materials Research Center, Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), 92 Chudong-ro, Bongdong-eup, Wanju-gun, Jeonbuk 565-905, Republic of Korea;2. Nanomaterials Science and Engineering, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 305-350, Republic of Korea;1. Multifunctional Structural Composite Research Center, Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), 92 Chudong-ro, Bongdong-eup, Wanju-gun, Jeonbuk, 55324, Republic of Korea;2. Department of Organic Materials and Fiber Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonbuk, 54896, Republic of Korea
Abstract:The anisotropic development of thermal conductivity in polymer composites was evaluated by measuring the isotropic, in-plane and through-plane thermal conductivities of composites containing length-adjusted short and long multi-walled CNTs (MWCNTs). The thermal conductivities of the composites were relatively low irrespective of the MWCNT length due to their high contact resistance and high interfacial resistance to polymer resins, considering the high thermal conductivity of MWCNTs. The isotropic and in-plane thermal conductivities of long-MWCNT-based composites were higher than those of short-MWCNT-based ones and the trend can accurately be calculated using the modified Mori-Tanaka theory. The in-plane thermal conductivity of composites with 2 wt% long MWCNTs was increased to 1.27 W/m·K. The length of MWCNTs in polymer composites is an important physical factor in determining the anisotropic thermal conductivity and must be considered for theoretical simulations. The thermal conductivity of MWCNT polymer composites can be effectively controlled in the processing direction by adjusting the length of the MWCNT filler.
Keywords:A  Polymer-matrix composites (PMCs)  B  Thermal properties  C  Micro-mechanics  D  Thermal analysis
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